Connected: An Internet Encyclopedia
RFC 1630 - 4.2.10. Message-Id

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### 4.2.10. Message-Id

For systems which include information transferred using mail protocols, there is a need to be able to make cross-references between different items of information, even though, by the nature of mail, those items are only available to a restricted set of people.

Two schemes are defined. The first, "mid:", refers to the STD 11, RFC 822 Message-Id of a mail message. This Identifier is already used in RFC 822 in for example the References and In-Reply-to field. The rest of the URL after the "mid:" is the RFC822 msg-id with the constant <> wrapper removed, leaving an identifier whose format in fact happens to be the same as addr-spec format for mailboxes (though the semantics are different).

The use of a "mid" URL implies access to a body of mail already received. If a message has been distributed using NNTP or other usenet protocols over the news system, then the "news:" form should be used.

Next: 4.2.11. Content-Id

Connected: An Internet Encyclopedia
RFC 1630 - 4.2.10. Message-Id